Water Plans & Reports

Water Reports

The City of Modesto domestic water system supplies water to communities in the surrounding region including Waterford, Hickman, Del Rio, Salida, Empire, Grayson, and small portions of Ceres and Turlock. Since 1995, the Modesto Regional Water Treatment Plant (MRWTP) has provided treated surface water to the City of Modesto water system. Remaining water needs are met with well water. This mixed use of both surface water and groundwater has ensured delivery of safe, reliable drinking water to the Modesto area, while minimizing the impact to the groundwater supply.

Riverdale Water System Improvements Project

The City of Modesto is coordinating with the Riverdale Park Tract Community Services District (RPTCSD) utilizing State grant funding and supporting resources to construct improvements to the Riverdale Water System. This project will bring the water system up to City Standards as part of an effort for the City of Modesto to provide the Riverdale Community with City-supplied water in place of the District’s groundwater well.  A Draft Initial Study/Mitigated Negative Declaration (IS/MND) has been completed and posted below for public review. Please see the posted Notice of Availability for instructions to comment on the IS/MND.

Environmental Documents

Digital appendix are available upon request by emailing us.  

Master & Management Plans

Modesto Water Master Plan

  1. Chapter 0 Executive Summary (PDF)
  2. Chapter 1 Introduction (PDF)
  3. Chapter 2 Existing System (PDF)
  4. Chapter 3 Water Demands (PDF)
  5. Chapter 4 Existing Water Supply (PDF)
  6. Chapter 5 Supply Plan (PDF)
  7. Chapter 6 Planning and Design Criteria (PDF)
  8. Chapter 7 Hydraulic Model Updates (PDF)
  9. Chapter 8 Existing Water System Evaluation (PDF)
  10. Chapter 9 Future Water System Evaluation (PDF)
  11. Chapter 10 Strategic Water System Planning (PDF)
  12. Chapter 11 Capital Improvement Program (PDF)

Modesto Water Master Plan Appendices

  1. Appendix A (PDF)
  2. Appendix B (PDF)
  3. Appendix C (PDF)
  4. Appendix D (PDF)
  5. Appendix E (PDF)
  6. Appendix F (PDF)
  7. Appendix G (PDF)
  8. Appendix H (PDF)
  9. Appendix I (PDF)
  10. Appendix J (PDF)
  11. Appendix K (PDF)
  12. Appendix L (PDF)
  13. Appendix M (PDF)
  14. Appendix N (PDF)
  15. Appendix O (PDF)
  16. Appendix P (PDF)
  17. Appendix Q (PDF)
  18. Appendix R (PDF)
  19. Appendix S (PDF)
  20. Appendix T (PDF)
  21. Appendix U (PDF)

Management Plans

  1. Final East Stanislaus Integrated Regional Water Management Plan (PDF)
  2. Final East Stanislaus Integrated Regional Water Management Plan Appendices (PDF)
  3. Final Integrated Regional Groundwater Management Plan (IRGMP) (PDF)
  4. Turlock Groundwater Basin Groundwater Management Plan (TGBA) (PDF)

Environmental Impact Reports

  1. 2010 Water System Engineers Report Draft Program EIR (PDF)
  2. Addendum to MRWTP SEIR - North Water Storage Tank (PDF)

Preliminary Design Reports

  1. Del Rio Tank, Pump Station and New Well PDR (PDF)
  2. Downstream Improvement Prelim Design Report (PDF)
  3. Industrial Tank 13 and Pump Station PDR (PDF)

Regulatory & Public Health Reports

  1. Public Health Goal Exceedance Report - 2007 (PDF)

Public Review

  1. Water Master Plan Environmental Impact Report (PDF)
  2. Water Master Plan Environmental Impact Report Appendices (PDF)